Asus MEL-C User manual

R
MEL-C
Socket 370 Motherboard
USER’S MANUAL

2ASUS MEL-C User’s Manual
USER'S NOTICE
Product Name: ASUS MEL-C
Manual Revision: 1.02 E354
Release Date: March 1999
No part of this manual, including the products and software described in it, may be repro-
duced, transmitted, transcribed, stored in a retrieval system, or translated into any language in
any form or by any means, except documentation kept by the purchaser for backup purposes,
without the express written permission of ASUSTeK COMPUTER INC. (“ASUS”).
ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
WARRANTIES OR CONDITIONS OF MERCHANTABILITYOR FITNESS FORAPAR-
TICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS DIRECTORS, OFFICERS,
EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDEN-
TAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF
PROFITS, LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSI-
NESS AND THE LIKE), EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY
OF SUCH DAMAGES ARISING FROM ANY DEFECT OR ERROR IN THIS MANUAL
OR PRODUCT.
Product warranty or service will not be extended if: (1) the product is repaired, modified or
altered, unless such repair, modification of alteration is authorized in writing byASUS; or (2)
the serial number of the product is defaced or missing.
Products and corporate names appearing in this manual may or may not be registered trade-
marks or copyrights of their respective companies, and are used only for identification or
explanation and to the owners’ benefit, without intent to infringe.
• Intel, LANDesk, and Pentium are registered trademarks of Intel Corporation.
• IBM and OS/2 are registered trademarks of International Business Machines.
• Symbios is a registered trademark of Symbios Logic Corporation.
• Windows and MS-DOS are registered trademarks of Microsoft Corporation.
• Adobe and Acrobat are registered trademarks of Adobe Systems Incorporated.
The product name and revision number are both printed on the product itself. Manual revi-
sions are released for each product design represented by the digit before and after the period
of the manual revision number. Manual updates are represented by the third digit in the manual
revision number.
For previous or updated manuals, BIOS, drivers, or product release information, contactASUS
at http://www.asus.com.tw or through any of the means indicated on the following page.
SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUALARE FUR-
NISHED FOR INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT
ANY TIME WITHOUT NOTICE, AND SHOULD NOT BE CONSTRUED AS A COM-
MITMENT BY ASUS. ASUS ASSUMES NO RESPONSIBILITY OR LIABILITY FOR
ANYERRORS OR INACCURACIESTHATMAYAPPEARINTHIS MANUAL, INCLUD-
ING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.
Copyright © 1999 ASUSTeK COMPUTER INC. All Rights Reserved.

ASUS MEL-C User’s Manual 3
ASUS CONTACT INFORMATION
ASUSTeK COMPUTER INC. (Asia-Pacific)
Marketing
Address: 150 Li-Te Road, Peitou, Taipei, Taiwan 112
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support
Tel (English): [phone] ext. 706
Tel (Chinese): [phone] ext. 701
Fax: [phone]
Email: [email protected]
Newsgroup: news2.asus.com.tw
WWW: www.asus.com.tw
FTP: ftp.asus.com.tw/pub/ASUS
ASUS COMPUTER INTERNATIONAL (America)
Marketing
Address: 6737 Mowry Avenue, Mowry Business Center, Building 2
Newark, CA 94560, USA
Fax: [phone]
Email: [email protected]
Technical Support
Fax: [phone]
BBS: [phone]
Email: [email protected]
WWW: www.asus.com
FTP: ftp.asus.com.tw/pub/ASUS
ASUS COMPUTER GmbH (Europe)
Marketing
Address: Harkort Str. 25, 40880 Ratingen, BRD, Germany
Telephone: [phone]
Fax: [phone]
Email: [email protected]
Technical Support
Hotline: [phone]
BBS: 49-2102-448690
Email: [email protected]
WWW: www.asuscom.de
FTP: ftp.asuscom.de/pub/ASUSCOM

4ASUS MEL-C User’s Manual
CONTENTS
I. INTRODUCTION.............................................................................. 7
How this manual is organized............................................................. 7
Item Checklist ..................................................................................... 7
II. FEATURES ....................................................................................... 8
The ASUS MEL-C Motherboard ........................................................ 8
Parts of the ASUS MEL-C Motherboard .......................................... 11
III. HARDWARE SETUP.................................................................... 12
ASUS MEL-C Motherboard Layout................................................. 12
Hardware Setup Steps ....................................................................... 14
1. Motherboard Settings.................................................................... 14
2. System Memory (DIMM) ............................................................. 17
DIMM Memory Installation .................................................. 18
3. Central Processing Unit (CPU).................................................... 19
4. Expansion Cards ........................................................................... 21
Expansion Card Installation Procedure ................................. 21
Assigning IRQs for Expansion Cards.................................... 21
Assigning DMA Channels for ISA Cards.............................. 22
Accelerated Graphics Port (AGP) ......................................... 22
5. External Connectors..................................................................... 23
Power Connection Procedures .......................................................... 33
Flash Memory Writer Utility ............................................................ 34
IV. BIOS SETUP................................................................................... 34
Main Menu .................................................................................. 34
Managing and Updating Your Motherboard’s BIOS................... 36
6. BIOS Setup .................................................................................. 37
Load Defaults ........................................................................ 38
Standard CMOS Setup ................................................................ 38
Details of Standard CMOS Setup:......................................... 38
BIOS Features Setup ................................................................... 41
Details of BIOS Features Setup............................................. 41
Chipset Features Setup ................................................................ 44
Details of Chipset Features Setup.......................................... 44
Power Management Setup........................................................... 47
Details of Power Management Setup .................................... 47
PNP and PCI Setup ..................................................................... 50
Details of PNP and PCI Setup ............................................... 50
Load BIOS Defaults .................................................................... 52
Load Setup Defaults .................................................................... 52

ASUS MEL-C User’s Manual 5
CONTENTS
Supervisor Password and User Password ................................... 53
IDE HDD Auto Detection ........................................................... 54
Save & Exit Setup ....................................................................... 55
Exit Without Saving .................................................................... 55
V. SOFTWARE SETUP ...................................................................... 59
VI. SOFTWARE REFERENCE......................................................... 65
VII. APPENDIX.................................................................................... 78

6ASUS MEL-C User’s Manual
FCC & DOC COMPLIANCE
FederalCommunications Commission Statement
This device complies with FCC Rules Part 15. Operation is subject to the following
two conditions:
• This device may not cause harmful interference, and
• This device must accept any interference received, including interference that
may cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installa-
tion. This equipment generates, uses and can radiate radio frequency energy and, if
not installed and used in accordance with manufacturer’s instructions, may cause
harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try to correct the interfer-
ence by one or more of the following measures:
• Re-orient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment to an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
WARNING! Be sure that there is sufficient air circulation across the processor’s
heatsink by regularly checking that your CPU fan is working. Without sufficient
circulation, the processor could overheat and damage both the processor and the
motherboard. You may install an auxiliary fan, if necessary.
CanadianDepartment of Communications Statement
This digital apparatus does not exceed the Class B limits for radio noise emissions
from digital apparatus set out in the Radio Interference Regulations of the Canadian
Department of Communications.

ASUS MEL-C User’s Manual 7
I. INTRODUCTION
I. INTRODUCTION
Sections/Checklist
How this manual is organized
This manual is divided into the following sections:
I. Introduction Manual information and checklist
II. Features Information and specifications concerning this product
III. Hardware Setup Instructions on setting up the motherboard
IV. BIOS Setup Instructions on setting up the BIOS software
V. Software Setup Instructions on setting up the included support software
VI. Software Reference Reference material for the included support software
VII. Appendix Information on available optional hardware
Item Checklist
Check that your package is complete. If you discover damaged or missing items,
please contact your retailer.
(1) ASUS Motherboard
(1) IDE ribbon cable for master and slave drives
(1) Ribbon cable for (1) 5.25” and (2) 3.5” floppy disk drives
(1) Bag of spare jumper caps
(1) Support CD with drivers and utilities
(1) This Motherboard User’s Manual
ASUS IrDA-compliant infrared module (optional)
ASUS PCI-L101 Wake-On-LAN 10/100 Fast Ethernet Card (optional)

8ASUS MEL-C User’s Manual
II. FEATURES
Features
II. FEATURES
The ASUS MEL-C Motherboard
The ASUS MEL-C motherboard is carefully designed for the demanding PC user
who wants many intelligent features in a small package.
Specifications:
•IntelProcessorSupport:SupportsIntelCeleronprocessors(300MHzandfaster)
designed for the Socket 370 and packaged in a Plastic Pin Grid Array (PPGA).
•Intel AGPset: Features Intel’s 440LX AGPset with a 66MHz Front Side Bus
and I/O subsystems.
•Enhanced ACPI & Anti-Boot Virus BIOS: Programmable BIOS (Flash
EEPROM),offeringenhancedACPI forWindows 98 compatibility, built-in firm-
ware-based virus protection, and autodetection of most devices for virtually au-
tomatic setup.
•Versatile Memory: Equipped with three DIMM sockets to support Intel PC66-
compliant SDRAMs (8, 16, 32, 64, 128, or 256MB) up to 768MB.
•AGP Slot: Supports an Accelerated Graphics Port card for high performance,
component level interconnect targeted at 3D graphical display applications sup-
porting a 1X or 2X mode bus.
•OnboardAudio (optional): Features an ESS Solo-1 32-bit PCI audio onboard.
Includes a complete online help to guide you through the audio software.
•PCI & ISA Expansion: Provides four 32-bit PCI and two 16-bit ISA expansion
slots.
•Wake-On-LAN Connector: Supports Wake-On-LAN activity through an op-
tional ASUS PCI-L101 Fast Ethernet card or a similar ethernet card.
•SB-Link™: Features Creative’s SB-Link™, allowing SB16 compatibility, us-
ing Intel’s PC-PCI and serialized IRQ protocols, toAWE64D or compatible PCI
audio cards.
• Super Multi-I/O: Provides two high-speed UART compatible serial ports and
one parallel port with EPP and ECP capabilities.
• Desktop ManagementInterface (DMI): Supports DMI through BIOS, which
allows hardware to communicate within a standard protocol creating a higher
level of compatibility. (Requires DMI-enabled components.)
•UltraDMA/33BM IDE:Comes with an onboard PCI Bus Master IDE controller
with two connectors that support four IDE devices in two channels, supports Ultra
DMA/33, PIO Modes 3 and 4 and Bus Master IDE DMA Mode 2, and supports
Enhanced IDE devices, such as Tape Backup, CD-ROM, and LS-120 drives.
•Easy Installation: Equipped with BIOS that supports autodetection of hard
drives, PS/2 mouse, and Plug and Play devices to make setup of hard drives,
expansion cards, and other devices virtually automatic.

ASUS MEL-C User’s Manual 9
II. FEATURES
II. FEATURES
Features
Performance:
• ACPIReady:ACPI(Advanced Configuration and Power Interface) isalsoimple-
mented on all ASUS smart series motherboards. ACPI provides more Energy
Saving Features for future operating systems (OS) supporting OS Direct Power
Management (OSPM) functionality. With these features implemented in the OS,
PCs can be ready around the clock, yet satisfy all the energy saving standards.
To fully utilize the benefits ofACPI, anACPI-supported OS such as the succes-
sor of Windows 95 must be used.
• Double the IDE Transfer Speed: IDE transfers using UltraDMA/33 Bus Mas-
ter IDE can handle rates up to 33MB/sec. The best of all is that this new technol-
ogy is compatible with existingATA-2 IDE specifications so there is no need to
upgrade current hard drives or cables.
•Concurrent PCI: Concurrent PCI allows multiple PCI transfers from PCI mas-
ter buses to memory to CPU.
• PC’98Compliant: BoththeBIOSand hardware levels of the motherboard meets
PC’98 compliancy. The new PC’98 requirements for systems and components are
based on the following high-level goals: Support for Plug and Play compatibility
and power management for configuring and managing all system components,
and 32-bit device drivers and installation procedures for Windows 95/98/NT.
• SDRAM Optimized Performance: ASUS smart series motherboards support
the new generation memory, Synchronous Dynamic Random Access Memory
(SDRAM),whichincreasesthedatatransferrateto528MB/smaxusingSDRAM.
•IrDA: Supports an optional infrared port module for wireless interface.
•Quick Adjustments: Changing CPU and onboard features settings is a snap
with easy-to-access DIP switches.

10 ASUS MEL-C User’s Manual
II. FEATURES
Features
II. FEATURES
Intelligent Features:
• Dual Function Power Button: The system can be in one of two states, one is
Sleep mode and the other is the Soft-Off mode. Pushing the power button for
less than 4 seconds places the system into Sleep mode. When the power button
is pressed for more than 4 seconds, it enters the Soft-Off mode.
• Remote Ring On (requires modem): This allows a computer to be turned on
remotely through an internal or external modem. With this benefit on-hand, any
usercanaccessvitalinformationfromtheircomputerfrom anywhere in the world!
• Message LED (requires ACPI OS support): Chassis LEDs now act as infor-
mation providers. Through the way a particular LED illuminates, the user can
determine the stage the computer is in.A simple glimpse provides useful infor-
mation to the user.
• Keyboard Power Up: Keyboard Power Up can be enabled or disabled to allow
the computer to be powered on by pressing the space bar on the keyboard.

ASUS MEL-C User’s Manual 11
Parts of the ASUS MEL-C Motherboard
II. FEATURES
II. FEATURES
Motherboard Parts
T: PS/2 Mouse
B: PS/2 Keyboard
B: COM 1
T: USB 1
B: USB 2
3 DIMM Sockets
Multi-I/O Chip
4 PCI Slots
Wake-On-LAN
Connector DIP
Switches
T: Joystick/Midi
B: Out/In/Mic
(Optional)
AGP Port
Intel PIIX4 PCIset
SB-Link
TM
Connector Wake-On-Ring
Connector
2ISASlots
Programmable
Flash EEPROM
ESS Solo-1Audio
(Optional)
B: COM 2
T: Parallel/Printer
B: Serial Ports
Intel 440LX
AGPset
Socket 370
ATX Power
Connector IDE1 & 2

12 ASUS MEL-C User’s Manual
III. HARDWARE SETUP
ASUS MEL-C Motherboard Layout
Motherboard Layout
III. H/W SETUP
PCI Slot 1
PCI Slot 2
PCI Slot 4
PCI Slot 3
DIMM Socket 1 (64/72 bit, 168 pin module) DIMM Socket 2 (64/72 bit, 168 pin module) DIMM Socket 3 (64/72 bit, 168 pin module)
Intel
440LX
AGPset
Intel
PIIX4
Chipset
MODEM
Socket 370
COM1
PARALLEL PORT
COM2
USB
T: Port 1
B: Port 2
PS/2
T: Mouse
B: Keyboard
CR2032 3V
Lithium Cell
CMOS Power
PANEL
IDELED
Accelerated Graphics Port
FLOPPY
CPU_FAN PWR_FAN
SBLINK
SECONDARY IDE
PRIMARY IDE
ISA Slot 1
ISA Slot 2
ATX Power Conenctor
CHA_FAN
WOL_CON
CD2
SMB
DIP
Switches
CD1
AUX
Multi-
I/O
Chip
ESS
Audio
Chipset
GAME/AUDIO
Mic
In Line
Out
Line
In
2Mbit Flash EEPROM
(Programmable BIOS)
KBPWR
IR
WOR
CLRTC
1 0
Row 3 2 5 4
(Grayed items are optional at the time of purchase.)

ASUS MEL-C User’s Manual 13
III. HARDWARE SETUP
Motherboard Settings
1) KBPWR p. 14 Keyboard Power Up (Enable/Disable)
2) DIP5 p. 15 Onboard Audio Setting
3) DIP6 p. 15 VIO Setting
4) DIP1,2,3 p. 16 CPU Bus Frequency
5) DIP7,8,9,10 p. 16 CPU Core:Bus Frequency Multiple
Expansion Slots
1) DIMM1,2,3 p.17 168-Pin DIMM Memory Support
2) Socket 370 p. 19 Central Processing Unit (CPU) Socket
3) SLOT1, SLOT2 p. 21 16-bit ISA Bus Expansion Slots
*
4) PCI1,2,3,4 p. 22 32-bit PCI Bus Expansion Slots
5) AGP p. 22 Accelerated Graphics Port
Connectors
1) PS2KBMS p. 23 PS/2 Mouse Connector (6-pin female)
2) PS2KBMS p. 23 PS/2 Keyboard Connector (6-pin female)
3) USB p. 24 Universal Serial BUS Ports 1 & 2 (Two 4-pin female)
4) PRINTER p. 24 Parallel Port Connector (25-pin female)
5) COM1, COM2 p. 24 SerialPortCOM1and COM2Connectors (9-pinmale)
6) GAME_AUDIO p. 25 Joystick/Midi Connector (15-pin female) (optional)
7) GAME_AUDIO p. 25 Audio PortConnectors (Three 1/8”female) (optional)
8) ATXPWR p. 25 ATX Power Supply Connector (20 pins)
9) PRIMARY/SECONDARYIDE p. 26 Primary/Secondary IDE Connectors (Two 40-1pins)
10) FLOPPY p. 26 Floppy Disk Drive Connector (34-1pins)
11) CHA_, CPU_, PWR_FAN p. 27 Chassis,CPU,PowerSupplyFanConnectors(Three3-pin)
12) WOL_CON p. 27 Wake-On-LAN Connector (3 pins)
13) WOR p. 28 Wake-On-Ring Connector (2 pins)
14) IR p. 28 IrDA-Compliant Infrared Module Connector (5 pins)
15) IDELED p. 29 IDE LED Activity Light (2 pins)
16) SBLINK p. 29 SB-Link
TM
Connector (6-1 pins)
17) MODEM p. 29 Modem Card Voice In Connector (4 pins)
18) SMB p. 30 SMBus Connector (5-1 pins)
19) AUX/CD1/CD2 p. 30 Stereo Audio In Connectors (Three 4-pin)
20) MSG.LED (PANEL) p. 31 System Message LED (2 pins)
21) SMI (PANEL) p. 31 SMI Switch Lead (2 pins)
22) PWR.SW (PANEL) p. 31 ATX Power & Soft-Off Switch Lead (2 pins)
23) RESET (PANEL) p. 31 Reset Switch Lead (2 pins)
24)
PWR.LED ( PANEL ) p. 31 System Power LED Lead (3-1 pins)
25)
KEYLOCK ( PANEL ) p. 31 Keyboard Lock Switch Lead (2 pins)
26) SPEAKER (PANEL) p. 31 System Warning Speaker Connector (4 pins)
Layout Contents
III. H/W SETUP

14 ASUS MEL-C User’s Manual
III. HARDWARE SETUP
Motherboard Settings
III. H/W SETUP
1. Keyboard Power Up (3-pin KBPWR)
This allows you to disable or enable the keyboard power up function. Set this
jumper to Enable if you wish to use your keyboard (by pressing the spacebar) to
power up your computer. This feature requires an ATX power supply that can
supply at least 300mAon the +5VSB lead. The default is set to Disable because
not all computers have the appropriate ATX power supply. Your computer will
not power on if you set this to Enable and if you do not have the right ATX
power supply.
MEL-C Keyboard Power Up
Disable
(Default)
KBPWR
Enable
1
2
3
1
2
3
KBPWR
Hardware Setup Steps
Before using your computer, you must complete the following steps:
1. Check Motherboard Settings
2. Install Memory Modules
3. Install the Central Processing Unit (CPU)
4. Install Expansion Cards
5. Connect Ribbon Cables, Panel Wires, and Power Supply
6. Setup the BIOS Software
1. Motherboard Settings
WARNING!Computer motherboards, baseboards and components, such asSCSI
cards, contain very delicate Integrated Circuit (IC) chips. To protect them against
damage from static electricity, you should follow some precautions whenever you
work on your computer.
1. Unplug your computer when working on the inside.
2. Use a grounded wrist strap before handling computer components. If you do
not have one, touch both of your hands to a safely grounded object or to a
metal object, such as the power supply case.
3. Hold components by the edges and try not to touch the IC chips, leads or
connectors, or other components.
4. Place components on a grounded antistatic pad or on the bag that came with
the component whenever the components are separated from the system.

ASUS MEL-C User’s Manual 15
III. HARDWARE SETUP
III. H/W SETUP
Motherboard Settings
Motherboard Feature Settings (DIP Switches)
The motherboard’s onboard features can be adjusted through the DIP switches. The
white block represents the switch’s position. The example below shows all the
switches in the OFF position.
MEL-C DIP Switch
OFF
ON
12345678910
ON
<Frequency Selector
<Frequency Selector
<Frequency Selector
<Reserved
<Onboard Audio Setting
<VIO Setting
<Frequency Multiple Selector
<Frequency Multiple Selector
<Frequency Multiple Selector
<Frequency Multiple Selector
2. OnboardAudio Setting (DIP5)
The onboard audio can be turned ON or OFF using DIP5.
MEL-C Audio Setting
ON
12345678910
Disable
ON
12345678910
Enable
3. VIO Setting (DIP6)
The onboard voltage regulator allows you to select the voltage supplied to the
DRAM, chipset, AGP, and the CPU’s I/O buffer. IMPORTANT! Setting this
jumper to Add 0.1 Volt may cause your system to become unstable. It is strongly
recommended that you leave this jumper on its default setting of Normal (3.5V).
ON
12345678910
ON
12345678910
MEL-C VIO Setting
Normal Add 0.1Volt

16 ASUS MEL-C User’s Manual
III. HARDWARE SETUP
Motherboard Settings
III. H/W SETUP
4. CPU External (BUS) Frequency Selection (DIP1, 2, 3)
These DIP switches tell the clock generator what frequency to send to the CPU.
These allow the selection of the CPU’s External frequency (or BUS Clock). The
BUS Clock times the BUS Ratio equals the CPU's Internal frequency (the ad-
vertised CPU speed).
MEL-C CPU BUS Frequency Selection
CPU/AGP
PCI BUS →
→66MHz
33MHz
ON
12345678910
ON
12345678910
83MHz
41MHz 68MHz 34MHz
ON
12345678910
75MHz
37MHz
ON
12345678910
5. CPU to BUS Frequency Multiple (DIP7, 8, 9, 10)
These DIP switches set the frequency multiple between the Internal frequency
of the CPU and the External frequency (called the BUS Clock) within the CPU.
MEL-C CPU : BUS Frequency Multiple
8.0x(8/1)
ON
12345678910
7.5x(15/2)
ON
12345678910
7.0x(7/1)
ON
12345678910
6.5x(13/2)
ON
12345678910
ON
12345678910
6.0x(6/1)5.0x(5/1)
ON
12345678910
4.5x(9/2)
ON
12345678910
4.0x(4/1)
ON
12345678910
3.5x(7/2)
ON
12345678910
ON
12345678910
3.0x(3/1) 5.5x(11/2)
ON
12345678910
Set the DIP switchesbythe Internal speed of your processor asfollows:
(BUS Frequency) (Frequency Multiple)
Intel CPU Model Speed Mult Freq. DIP1 DIP2 DIP3 DIP7 DIP8 DIP9 DIP10
Celeron (PPGA) 466MHz 7.0x 66MHz [OFF] [OFF] [OFF] [ON] [OFF] [ON] [OFF]
Celeron (PPGA) 433MHz 6.5x 66MHz [OFF] [OFF] [OFF] [OFF] [ON] [ON] [OFF]
Celeron (PPGA) 400MHz 6.0x 66MHz [OFF] [OFF] [OFF] [ON] [ON] [ON] [OFF]
Celeron (PPGA) 366MHz 5.5x 66MHz [OFF] [OFF] [OFF] [OFF] [OFF] [OFF] [ON]
Celeron (PPGA) 333MHz 5.0x 66MHz [OFF] [OFF] [OFF] [ON] [OFF] [OFF] [ON]
Celeron (PPGA) 300MHz 4.5x 66MHz [OFF] [OFF] [OFF] [OFF] [ON] [OFF] [ON]

ASUS MEL-C User’s Manual 17
III. HARDWARE SETUP
System Memory
III. H/W SETUP
General DIMM Notes
• Two possible memory chips are supported: SDRAM with and without ECC.
• SDRAM chips are generally thinner with higher pin density than EDO (Ex-
tended Data Output) chips.
• BIOS shows SDRAM memory on bootup screen.
• 8chips/sidemodulesdonot support ECC, only 9 chips/sidemodulessupportECC.
• Single-sided DIMMs come in 16, 32, 64,128MB; double-sided come in 32, 64,
128, 256MB.
2. System Memory (DIMM)
NOTE: No hardware or BIOS setup is required after adding or removing memory.
This motherboard uses only Dual Inline Memory Modules (DIMMs). Sockets are
available for 3.3Volt (power level) unbuffered Synchronous Dynamic Random Ac-
cess Memory (SDRAM) of either 8, 16, 32, 64, 128MB, or 256MB. One side (with
memory chips) of the DIMM takes up one row on the motherboard.
To utilize the chipset’s Error Checking and Correction (ECC) feature, you must use a
DIMM module with 9 chips per side (standard 8 chips/side + 1 parity chip) and make
the proper settings in BIOS Chipset Features Setup of BIOS SETUP.
Memoryspeedsetup is recommended through SDRAM Configuration under “Chipset
Features Setup” in BIOS SETUP.
WARNING!Memory modules must have 18 chips or less. Memory modules with
more than 18 chips exceed specifications and may cause unstable operation.
Install memory in any combination as follows:
DIMM Location 168-pin DIMM Total Memory
Socket 1 (Rows 0&1) SDRAM 8, 16, 32, 64, 128, 256MB x1
Socket 2 (Rows 2&3) SDRAM 8, 16, 32, 64, 128, 256MB x1
Socket 3 (Rows 4&5) SDRAM 8, 16, 32, 64, 128, 256MB x1
Total System Memory (Max 768MB) =

18 ASUS MEL-C User’s Manual
DIMM Memory Installation
Insert the module(s) as shown. Because the number of pins are different on either
side of the breaks, the module will only fit in the orientation as shown. DIMM
modules are longer and have different pin contact on each side and therefore have a
higher pin density. SIMM modules have the same pin contact on both sides.
MEL-C 168-Pin DIMM Sockets
Lock
FRONT
20 Pins 60 Pins 88 Pins
TheDIMMsmustbe3.3VUnbufferedfor this motherboard.To determine the DIMM
type, check the notches on the DIMMs (see figure below).
168-Pin DIMM Notch Key Definitions (3.3V)
DRAM Key Position Voltage Key Position
Unbuffered
RFU
Buffered Reserved
3.3V
5.0V
The notches on the DIMM module will shift between left, center, or right to identify
the typeand alsoto prevent the wrongtype from being inserted intothe DIMM slot on
the motherboard.You must ask your retailer the correct DIMM type before purchas-
ing. This motherboard supports four clock signals.
III. HARDWARE SETUP
System Memory
III. H/W SETUP

ASUS MEL-C User’s Manual 19
III. HARDWARE SETUP
CPU
III. H/W SETUP
3. Central Processing Unit (CPU)
The motherboard provides a ZIF Socket 370. The CPU that came with the mother-
board should have a fan attached to it to prevent overheating. If this is not the case
then purchase a fan before you turn on your system.
WARNING! Be sure that there is sufficient air circulation across the processor’s
heatsink by regularly checking that your CPU fan is working. Without sufficient
circulation, the processor could overheat and damage both the processor and the
motherboard. You may install an auxiliary fan, if necessary.
To install a CPU, first turn off your system and remove its cover. Locate the ZIF
socket and open it by first pulling the lever sideways away from the socket then
upwards to a 90-degree right angle. Insert the CPU with the correct orientation as
shown. The notched corner should point towards the end the of the lever. Because
the CPU has a corner pin for two of the four corners, the CPU will only fit in the one
orientation as shown. The picture is for reference only; you should have a CPU fan
that will cover the face of the CPU. With the added weight of the CPU fan, no force
is required to insert the CPU. Once completely inserted, close the socket’s lever
while holding down the CPU.
NOTE: Set the bus frequency and multiple for your Socket 370 processor.
MEL-C Socket 370
Socket 370 CPU (Top) Socket 370 CPU (Bottom)
Notch

20 ASUS MEL-C User’s Manual
III. HARDWARE SETUP
CPU
III. H/W SETUP
(This page was intentionally left blank.)